2561560100 has 36 divisors (see below), whose sum is σ = 6063913968. Its totient is φ = 931476000.

The previous prime is 2561560097. The next prime is 2561560109. The reversal of 2561560100 is 10651652.

It is a self number, because there is not a number n which added to its sum of digits gives 2561560100.

It is not an unprimeable number, because it can be changed into a prime (2561560109) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1163246 + ... + 1165445.

Almost surely, 2^2561560100 is an apocalyptic number.

2561560100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2561560100 is an abundant number, since it is smaller than the sum of its proper divisors (3502353868).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2561560100 is a wasteful number, since it uses less digits than its factorization.

2561560100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2328716 (or 2328709 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 2561560100 is about 50611.8573063665. The cubic root of 2561560100 is about 1368.2585898142.

The spelling of 2561560100 in words is "two billion, five hundred sixty-one million, five hundred sixty thousand, one hundred".